I started using Rough Riders around a year ago. It depends what series, but their quality is mostly good, especially for the price. I think it is between stays the same and got better in a way they don't really improve old series, but newer ones are often better and fancier. And their blades are definitely better than Case. Both my Case came with a bad burr, dull edges and rounded tips while RRs were always pointy with useable to very good sharpness.
There are some bad models. This mentioned earlier large folding hunter truly was low quality also for me and doctor's knife had almost no spring tension and off center that it was shaving a liner when closing. But these are my only really bad examples and I bought many in the last year. Most common issue is blade centering. Not centered like modern folders, but almost never so bad it touches liners. And some, especially single bladed are quite centered.
I think you can safely get barlows, copperheads and trappers with swedges on blades. I had good luck and least issues with them. My friend have a few canoes and they were also good. At least full slipjoints, the one with one slipjoint and one lockback had spine gaps.
Out of all I have I can especially recommend small and medium single blade lockbacks, copper teardrop jack, bushcraft barlow, trappers from buckshot, black cherry and tortuga series. I'm not sure about UK laws, but if you can, get jigged bone work knife. It is a slipjoint but with unnecessary linerlock as a secondary safety. Very nice sodbuster like medium to larger knife. And the absolute best quality that I have is stag bone copperhead. Almost feels like it was from a different factory compared to others.
I only have one and two bladed RRs. If you are interested in multi blades patterns like congress, I have no idea about their quality.